RDS Multi-AZ versus Read Replicas
WHAT IT TESTS: availability versus scalability. OUTLINE: Multi-AZ is a synchronous standby for failover, replicas are async for read scaling, combine both when needed. RED FLAG: claiming the standby serves reads or that replicas auto-failover.
WHAT IT TESTS: whether you separate high availability from read scaling. ANSWER OUTLINE: Multi-AZ keeps a synchronous standby in another zone, invisible to traffic, that takes over automatically on failure, solving durability and uptime. Read replicas are asynchronous copies serving read-only queries to scale reads, but they lag and need manual promotion. Combine them for resilience plus read throughput. RED FLAG: saying the standby handles reads, or that a replica gives automatic failover.
Read the original → interview
- #aws
- #rds
- #high-availability
- #replication
- #databases
Get five bites like this every day.
Tezvyn delivers a daily feed of 60-second tech bites with quizzes to lock in what you learn.